San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Yangquan City, a prefecture-level city under the jurisdiction of Shanxi Province, was called "Yangquan" in ancient times. Located in the central and eastern part of Shanxi Province, adjacent to Xinzhou City in the north, Taihang Mountain and Shijiazhuang City in the east, Taiyuan City in the west and Jinzhong City in the south; with a total area of 4559 square kilometers, it is a new industrial city. Yangquan is located in the eastern edge of the Loess Plateau, belongs to the eastern mountains of Shanxi, the landforms in the territory are mainly mountains, the rest are hills and plains; it belongs to the warm temperate semi-humid continental monsoon climate zone. As of 2018, Yangquan City has jurisdiction over three districts and two counties, with a total population of 1.4144 million. Yangquan is the gateway of Sanjin, Shanxi and Hebei, located in the middle of the two provincial capitals of Taiyuan and Shijiazhuang, with a distance of 100 kilometers. Yangquan is also located in the combination zone of the eastern developed region and the central and western regions, as well as the two major scriptures around the Bohai Sea and the Yangtze River Delta.